<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="ie=edge">
	<title>图片响应式</title>
	<link rel="stylesheet" type="text/css" href="http://coding.imweb.io/demo/reset.css">
	<link rel="stylesheet" type="text/css" href="css/img.css">
</head>
<body>
	<div class="img-wrap">
		<img src="img/large.png" alt="">
	</div>
	<img src="img/medium.png" alt="">
	<img src="img/small.png" alt="">
</body>
</html>